Abstract Fenpyrazone is a novel 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicide used for postemergence (POST) application to control annual monocotyledon and dicotyledon weeds in summer maize (Zea mays L.). Annual double-cropping systems are popular on the North China Plain, especially summer maize in rotation with winter wheat (Triticum aestivum L.) or garlic (Allium sativum L.). In addition, vegetable crops have shown different levels of sensitivity to HPPD-inhibiting herbicides that were applied to preceding maize fields. However, there is no information about the effects of fenpyrazone on the succeeding crops. Here, field experiments were conducted twice at Dawenkou and Mazhuang to evaluate the response of successive rotation crops such as winter wheat, garlic and spinach (Spinacia oleracea L.) to fenpyrazone that was applied to preceding summer maize fields. Compared with the untreated weed-free control, none of the fenpyrazone treatments resulted in significant differences in the emergence of wheat, garlic and spinach at either location. When fenpyrazone was applied at 3 times the recommended rate to the preceding maize fields, there was no significant reduction in the wheat and garlic biomass despite the height of the garlic plants being reduced by 4.1% at 20 d after sowing (DAS) compared to that of the untreated weed-free control. Compared with wheat and garlic, spinach was more sensitive to fenpyrazone applications to preceding summer maize fields, and it reduced the plant heights by 2.6-17.1% at 20 DAS compared to those in the untreated weed-free control, with the loam soil in Mazhuang causing a higher biomass reduction than the sandy loam soil in Dawenkou. However, the biomass reduction stopped at 40 DAS, and no yield reduction was observed at harvest for all the fenpyrazone treatments at both locations. Based on this study, farmers on the North China Plain can safely grow winter wheat, garlic and spinach following fenpyrazone POST application at the recommended rate to preceding summer maize.

中文翻译：

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吡虫啉对华北平原一年生双季作物后茬的影响

摘要 Fenpyrazone 是一种新型的 4-羟基苯基丙酮酸双加氧酶 (HPPD) 抑制性除草剂，用于芽后 (POST) 应用以控制夏玉米 (Zea mays L.) 一年生单子叶和双子叶杂草。华北平原普遍采用一年生双熟制，尤其是夏玉米与冬小麦 (Triticum aestivum L.) 或大蒜 (Allium sativum L.) 轮作。此外，蔬菜作物对应用于先前玉米田的 ​​HPPD 抑制性除草剂表现出不同程度的敏感性。然而，没有关于吡唑啉酮对后代作物影响的信息。在这里，在大汶口和马庄进行了两次田间试验，以评估连续轮作作物如冬小麦、大蒜和菠菜（Spinacia oleracea L. ) 适用于先前夏玉米田的吡唑啉酮。与未经处理的无杂草对照相比，吡唑啉酮处理均未导致任一位置小麦、大蒜和菠菜的出现显着差异。当在前面的玉米田中以推荐用量的 3 倍施用吡唑啉酮时，尽管与播种后 20 天大蒜植株的高度相比（DAS）降低了 4.1%，但小麦和大蒜生物量没有显着降低未经处理的无杂草对照。与小麦和大蒜相比，菠菜对先前夏玉米田施用吡唑啉酮更敏感，与未经处理的无杂草对照相比，在 20 DAS 时，它使株高降低了 2.6-17.1%，马庄的壤土比大汶口的砂壤土造成更高的生物量减少。然而，生物量减少在 40 DAS 时停止，并且在两个地点的所有芬吡酮处理的收获时均未观察到产量减少。根据这项研究，华北平原的农民可以按照推荐的比例施用吡唑啉酮 POST 后安全地种植冬小麦、大蒜和菠菜。